In Superman part 2 there is a scene where General Zod, Non and Ursa are sitting in the White House?

Ursa is playing with something that I know was very popular in the 1980's. It was a bunch of silver balls hanging from strings and you would just swing them around and they would hit eachother. Does anyone know what it was called?In Superman part 2 there is a scene where General Zod, Non and Ursa are sitting in the White House?It's called a Newton's Cradle.